PLEASE, I NEED AN EXPLANATION TO THIS FORMULAR

Someone posted this picture on his facebook timeline, with the inscription: "Very simple formular" LOL! I need an explanation to this formular.

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AuthorHouse Self Publishing Boook Company

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TOP 6 CAUSES OF KIDNEY DISEASE YOU NEED TO AVOID

KIDNEY DESERVES THE BEST The kidneys are bean-shaped organs that serve several essential regulatory roles in vertebrates. Their main function is to regulate the balance of electrolytes in the blood, along with maintaining pH homeostasis. They also remove excess organic molecules from the blood, and it is by this action that their best-known function is performed: the removal of waste products of metabolism.